Control methods of Gastrodia elata flower stem disease

Gastrodia floral stem black stem disease mainly occurs in Gastrodia elata sexual reproduction tuber and flower stem, is an important disease of Gastrodia elata sexual reproduction flower stem, after etiological detection, the pathogen of Gastrodia elata flower stem black stem disease is Fusarium oxysporum fungus, let's take a look at the prevention and control methods of Gastrodia elata flower stem disease!

Symptoms of Gastrodia elata flower stem disease

The damage to the flower stem usually starts near the base of the ground, showing black brown or black irregular disease spot at first, and then the annular black stem expands upward, and in severe cases, the disease part is easy to be broken. Longitudinal section of the diseased stem showed dark brown necrosis in the pith, and the infected flower stem died as soon as it was unearthed.

Incidence conditions of Gastrodia elata flower stem disease

Fusarium oxysporum belongs to the soil resident bacteria, if the conditions are suitable, it may be infected at any time to cause the disease. At Guizhou Gastrodia GAP Base in Baiyi Township, Wudang District, Guiyang City, the disease occurred from April to May, and the disease occurred in June. The disease began shortly after being used as a covering soil for sexual reproduction tuber. high temperature and high humidity are conducive to the occurrence and development of the disease. The disease was also found in wild Gastrodia elata in Longli County, Guizhou Province. The disease usually occurs when using tubers infected with black rot for sexual reproduction, and the disease occurs seriously in continuous cropping areas for many years.

Control methods of Gastrodia elata flower stem disease

The main results are as follows: 1. The site with few diseases is selected as the cultivation ground for sexual reproduction of Gastrodia elata, and the site should be disinfected and insecticidal before use.

2. The sound disease-free Gastrodia elata tubers were selected for sexual reproduction, and the tubers with black rot were not used for sexual reproduction.

3. Choose 50% carbendazim wettable powder 600 times 700 times liquid, or 70% mancozeb dry suspension powder 500 times liquid, or 75% chlorothalonil wettable powder 600 times liquid, or 60% Fangmaibao 2 water soluble powder 800 times 1000 times liquid and so on to spray or smear stems.